If your using LCI's ground control 3.0 here is the procedure:
After you have all 4 jacks on the ground, use manual mode to level the unit. Make sure it is level front to back and side to side using a level ( I use a 4') the longer the better.
Once the unit is level, turn the control panel off. Press the "front" pad 7 times followed by the "back" pad 7 times. The display should light up and give you the prompt to press "enter" for zero calibration.
If 7 presses doesn't do it, then try 10.
2012 Copper Canyon 273FWRET being towed by a 1994 Ford F350 CC,LB,Dually diesel.
Airlift 5000 bags, Prodigy brake control, 5 gauges on the pillar.Used to tow a '97 Jayco 323RKS.
Now an RVIA registered tech. Retired from Law enforcement in 2008 after 25+ yrs.